Submission #62823

#	Time	Username	Problem	Language	Result	Execution time	Memory
62823		SpaimaCarpatilor	Genetics (BOI18_genetics)	C++17	100 / 100	421 ms	21068 KiB

genetics

#include<bits/stdc++.h>

using namespace std;

int N, M, K;
char sir[5009][5009];
long long coef[5000], f[5009][4];

int code (char c)
{
    if (c == 'A') return 0;
    if (c == 'C') return 1;
    if (c == 'G') return 2;
    return 3;
}

int rand15 () {return rand () & 32767;}
int rand30 () {return (rand15 () << 15) | rand15 ();}
long long rand60 () {return ((long long) rand30 () * (1LL << 30)) | rand30 ();}

int main ()
{
//freopen ("input", "r", stdin);
//freopen ("output", "w", stdout);

srand (time (0));
scanf ("%d %d %d\n", &N, &M, &K);
for (int i=1; i<=N; i++)
    coef[i] = rand60 ();
for (int i=1; i<=N; i++)
{
    scanf ("%s", sir[i] + 1);
    for (int j=1; j<=M; j++)
        sir[i][j] = code (sir[i][j]),
        f[j][sir[i][j]] += coef[i];
}
for (int i=1; i<=N; i++)
{
    long long needed = 0, curr = 0;
    for (int j=1; j<=N; j++)
        if (j != i)
            needed += 1LL * K * coef[j];
    for (int j=1; j<=M; j++)
        for (int k=0; k<4; k++)
            if (k != sir[i][j])
                curr += f[j][k];
    if (curr == needed)
    {
        printf ("%d\n", i);
        return 0;
    }
}
return 0;
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:35:23: warning: array subscript has type 'char' [-Wchar-subscripts]
         f[j][sir[i][j]] += coef[i];
                       ^
genetics.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf ("%d %d %d\n", &N, &M, &K);
 ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
genetics.cpp:32:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%s", sir[i] + 1);
     ~~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 27 / 27
• Subtask 2: 19 / 19
• Subtask 3: 28 / 28
• Subtask 4: 26 / 26